Good communication about when you’re feeling jealous or neglected, mostly. Honestly jealousy doesn’t really come into it for me, I’m glad my gfs are getting more action especially as estrogen kills my libido. It takes a lot of pressure off to not need to be everything to someone.

Also my partners’ partners aren’t just random people, we’re all friends and I love them too, just not like I would partners. Uncoupling relationships from possessiveness is freeing tbqh. Even if I only had one partner and no plans to have more, us being theoretically poly would be important to me for that reason.